The potential difference between a pair of similar and parallel conducting plates is known. What additional information is needed in order to find the electric field strength between the plates?
Correct answer: A. Separation of the plates
- A. Separation of the plates
- B. Separation and area of the plates
- C. Permittivity of the medium; separation of the plates
- D. Permittivity of the medium; separation and area of the plates
Explanation
The correct answer is Option A: Separation of the plates. The electric field strength between parallel conducting plates can be calculated using the formula E = V/d, where V is the potential difference and d is the distance between the plates. Therefore, knowing the separation of the plates is the additional information needed to determine the electric field strength in this scenario.Options B, C, and D include unnecessary information such as the area of the plates and permittivity of the medium, which are not directly required to find the electric field strength between the plates.
This question appeared on the ETEA MDCAT 2013 paper, which you can sit online with every answer explained.
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About Electric Field Intensity
Electric field intensity is the force acting per unit positive test charge, with direction set by the force on that charge. Work includes fields of point charges, vector superposition, field lines and the relation between field and electric potential. Field intensity must be distinguished from electric force and potential.
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